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首页> 外文期刊>Environmental toxicology and chemistry >EFFECTS OF WATER pH ON COPPER TOXICITY TO EARLY LIFE STAGES OF THE COMMON CARP (CYPRINUS CARPIO)
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EFFECTS OF WATER pH ON COPPER TOXICITY TO EARLY LIFE STAGES OF THE COMMON CARP (CYPRINUS CARPIO)

机译：pH值对鲤鱼早期生命期铜毒性的影响

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摘要

Carp eggs were exposed immediately after fertilization to Cu concentrations of 0.3 and 0.8 μmol/L at water pH 7.6 or pH 6.3. Mortality, the incidence of spinal cord deformation, heart rate, tail movements, hatching success, and whole-body content of K, Na, Mg, Ca, and Cu were determined over time. Light microscopical preparations of eggs (48 h after fertilization) and larvae (168 h after fertilization) were studied. At pH 7.6, Cu did not affect egg mortality, heart rate, tail movements, and whole-body K and Mg contept. Hatching success increased only in the 0.3 μmol/L Cu group. Exposure to 0.8 μmol/L Cu increased larval mortality and larval deformation and decreased whole-body Na and Ca content. At pH 6.3, exposure to 0.8 μmol/L Cu increased egg mortality and decreased heart rate and tail movements. Furthermore, premature hatching, a concentration-dependent increase of larval mortality, and larval deformation was observed. Exposure to 0.3 and 0.8 μmol/L Cu decreased the whole-body content of K, Na, Mg, and Ca. Uptake of Cu after hatching increased two-fold at pH 6.3 compared to the pH 7.6 groups. At pH 6.3, all Cu-exposed larvae were unable to fill their swim bladder. Also, after 168 h the yolk sac remained largely unabsorbed in the 0.3 and 0.8 μmol/L Cu group. Exposure to 0.8 μmol/L Cu resulted in coagulation of proteins in eggs and yolk sacs. No significant changes in any of the assessed parameters were observed in control groups of pH 6.3 and pH 7.6.
机译：受精后立即将鲤鱼卵暴露于pH 7.6或pH 6.3的Cu浓度为0.3和0.8μmol/ L。随时间确定死亡率，脊髓变形的发生率，心率，尾巴运动，孵化成功率以及K，Na，Mg，Ca和Cu的全身含量。研究了卵（受精后48小时）和幼虫（受精后168小时）的光学显微制备。在pH值为7.6时，Cu不会影响卵的死亡率，心率，尾巴运动以及整个人体的K和Mg含量。孵化成功仅在0.3μmol/ L的Cu组中增加。暴露于0.8μmol/ L的铜会增加幼虫的死亡率和幼虫的变形，并降低全身的Na和Ca含量。在pH 6.3下，暴露于0.8μmol/ L的铜会增加卵的死亡率，并降低心率和尾巴运动。此外，观察到过早的孵化，幼虫死亡率的浓度依赖性增加以及幼虫变形。暴露于0.3和0.8μmol/ L的Cu会降低K，Na，Mg和Ca的全身含量。与pH 7.6组相比，孵化后Cu的吸收在pH 6.3时增加了两倍。在pH 6.3时，所有暴露于铜的幼虫都无法充满其游泳膀胱。同样，在168小时后，在0.3和0.8μmol/ L的Cu组中，卵黄囊基本上保持未被吸收。暴露于0.8μmol/ L的铜导致蛋和卵黄囊中的蛋白质凝结。在pH 6.3和pH 7.6的对照组中未观察到任何评估参数的显着变化。

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